Ith regard to sex-linked traits, the heterogametic sex,?

usually the male, is said to be hemizygous. what does this term mean? What two types of individuals can be used to testcross organisms for sex-linked traits?

Ith regard to sex-linked traits, the heterogametic sex,?
the two words are heterozygous and homozygous... it doesn't relate to people neccessarily, it could be for cells


Homozygous cells- same sex, have you ever heard about homos... it means that they are interested in the same sex.


heterozygous cells- different sex
Reply:The heterogametic sex is the sex that has two different sex chromosomes. In humans, this is the male because he has an X and a Y.





Hemizygous refers to the the fact that the heterogametic sex has only 1 copy of each allele. In the human male for example, he has only 1 copy of each gene on the X chromosome. Since the female has 2 copies of each allele, she can be either hetero or homozygous for an allele because she has the two X chromosomes.





To test cross organisms for sex linked traits, you'd probably want to use a female with a normal phenotype crossed to a male who expresses the recessive trait, since the point of a test cross is to determine whether or not the normal phenotyped person is homozygous dominant or heterozygous. If she is homozygous dominant, all children will be normal, but if she is heterozygous, 1/2 of the female offspring should be affected.

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